exam Maths Puzzle Numerical Ability

This is a special cubic volume formula

=ROUND(((0.005454(L+IF(L>=17,1,0.67)))(((D+0.7)^2+(B+0.7)^2+(D+0.7)(B+0.7))/3)),0)=V

Using real numbers

=ROUND(((0.005454(40+IF(

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exam Other Question

I need to write in simplest form

3 5/12 - 1 7/12 =

THanks I need help trying to solve this problem.
____3___ -__2__
12+x-x^2 x^2-9

Sure hope I did this right. This problem cam from the 10th Edition of Introductory to Algebra by Mar